Leaching kinetics and mechanism of alunite from alunite tailings in
A great many of investigations have been made on the utilization of alunite and recovery of its valuable products (Haff, 1943; Stevens et al., 1975; Loast, 1977; Tanaka, 1932; Mc Cullough, 1934; Kuçuk and Yildiz, 2006).In the hydrometallurgical process of alunite, leaching is a prerequisite step for the production of valuable potassium and aluminum products.
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An H 3 O-alunite method for production of smelter grade alumina …
Precipitation of H 3 O-alunite from an ammonium alum solution using boehmite as a seed was studied. The ammonium alum solution was obtained after high-pressure leaching of mullite-type coal fly ash (CFA) with a mixture of 7.5 M H 2 SO 4 + 40% NH 4 HSO 4 at 200 °C. ... The results show that smelter grade alumina (SGA) can be obtained at ...
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INNOVATIVE TECHNOLOGY FOR ALUMINA …
alumina reach clay in the above aluminium-producing countries. In addition, there are tens of billions of tones of sillimanite group minerals. Content of Al 20 3 in alumina rich clays and other non-bauxitic rocks can be as high 30-35%, content of alumina in such ores as nepheline and alunite rocks can be lower, in the range of 22-26%.
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(PDF) pH and Temperature Effects on Alunite Dissolution
Chemical Geology, 2015. The processes, rates, mechanisms, controlling factors and products of alunite (KAl3(SO4)2(OH)6) dissolution were assessed using batch dissolution experiments at pHs of c. 3, 4, 4.6, 7 and 8, and temperatures of c. 280, 293 and 313 K. Alunite dissolution is roughly congruent at pH 3, while at pH ≥ 3.9 the process is incongruent, giving a lower Al/K ratio in …
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Alunite
Alunite, KA13(SO4)2(OH)6, was used from the 15th century until early in the present century as a source of potash alum and aluminum sulfate. Since early in this century its use for this purpose has declined to virtually nil with acid treatment of bauxite or clay replacing alunite as a source of alum. During the First World War alunite served as an emergency source of potassium sulfate ...
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Cost Effective Technology of Alunite Ore Processing
In 1965, the Ganja Alumina plant (GAP) started implementing an alkaline reduction technology for processing of alunite ore on an industrial scale. Technological deficiencies, together with...
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New Insights into the Pre-Concentration of Alunite from a …
alunite is hydrometallurgical methods including calcination and leaching. Because the main gangue of alunite is quartz (around 40%), these methods lead to the formation of sodium aluminosilicate and potassium aluminosilicate complexes. These complexes cause losing alumina and leaching agents during the process.
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Method of Processing and Treatment of Alunite Ores
An alkaline reduction method for processing alunite ore [1] is known. This method was used in the Ganja Aluminum Combine (GGC). Due to significant technological drawbacks (such as low alumina yield of less than 70 pollution of the environment by dust and gas, a need for rare and expensive raw materials, large quantities of solid waste from 5 tons per 1 ton of alumina and …
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Alunite Alumina Me Ico
Alunite Ore. Alunite KAl 3 (SO 4) 2 (OH) 6, is a sulfate mineral ore used as a source of potash or for making alum. It occurs in potassium rich volcanic rocks that are white and grey in colour. It …
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Cost Effective Technology of Alunite Ore Processing
Further processing of the insoluble residue based on the Bayer out-of-autoclave process produces alumina and quartz sand. Besides alumina, this method makes it possible to get four …
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Processing of Aluminum Sulfates into Alumina
droxide is then used to obtain alumina by calcination. Much attention has been given by researchers to processing of alunite ores [3]. Alunites are sulfated aluminates of alkali metals- MAl3(OH)6(SO4)2, where M = Na, K. The sulfate products obtained in ore pro-cessing are used to obtain alumina by various meth-ods.
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THE FORMATION AND COEXISTENCE OF GIBBSITE, BOEHMITE, ALUMINA …
The formation and coexistence of four aluminum compounds, namely, gibbsite (Al(OH)3), boehmite (AlOOH), alumina (Al2O3) and alunite (NaAl3(OH)6(SO4)2) is reported under laboratory conditions. These solid phases were formed as hydrolytic products of aluminum sulphate solutions at room temperature. These results provide evidence that thermal conditions are not …
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Method of processing alunite into alumina
Method of processing alunite into alumina Download PDF Info Publication number SU462450A1. SU462450A1 SU721816820A SU1816820A SU462450A1 SU 462450 A1 SU462450 A1 SU 462450A1 SU 721816820 A SU721816820 A SU 721816820A SU 1816820 A SU1816820 A SU 1816820A SU 462450 A1 SU462450 A1 SU 462450A1 Authority SU USSR - Soviet Union …
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The recovery of potassium oxide and alumina from alunite …
The chemical compositions of alunite concentrate is presented in Table 1. The XRD pattern and corresponding mineralogical composition of alunite concentrate are given in Fig. 1 and Table 2, respectively. According to Fig. 1 and Table 2, the alunite concentrate is com-prised of alunite (KAl 3(SO 4) 2(OH) 6), dickite (Al Si O 5(OH) ), quartz (SiO
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Aluminum Oxide (Alumina), Calcined, Tabular, and
From commercial alumina type G-00 according to GOST 6912-54 it is possible to obtain finely ground calcined alumina containing more than 99.9% Al2O3 and 0.020% Na2O.
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Analysis of Technological Issues, Related to …
Taking into account the processing capacity of Ganja Alumina Plant (150,000 tons of alumina per year), this method allows the production of fertilizer, potassium sulfate (370,000 tons per year ...
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An H3O-alunite method for production of smelter grade alumina …
Smelter grade alumina (SGA) is an aluminum oxide (Al 2 O 3) with special parameters of chemical composition and physical properties (Lindsay and Lavoie, 2022). SGA …
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Effects of mechanical activation on alumina extraction from alunite …
The highest alumina extraction values from the non-activated alunite ore were ∼6% by leaching in 1M H 2 SO 4 solution for 30 min without calcination and ∼50% after calcination at 600°C for 1 h, followed by acid leaching under the same conditions. By comparison, for direct acid leaching of mechanically activated alunite ore without ...
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US1189254A
The invention is based upon the discovery that by calcining alunite in admixture with I coal or coke or other suitable carbonaceous material, under appropriate reducing conditions, the alunite can be freed or substantemperatures sufficiently low toprevent any appreciable loss of potash by volatilization and to prevent the conversion of the alumina to any considerable extent into an …
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XRD patterns of alunite prepared by the hydrothermal method at
Download scientific diagram | XRD patterns of alunite prepared by the hydrothermal method at different liquid–solid ratios: (a) 1:1, (b) 4:1, (c) 10:1 and (d) 20:1. ... When alumina is added in ...
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LME Alumina (Platts)
LME Alumina (Platts) 530.80 0.19% . Month 2 Closing Price (day-delayed) Contract specifications. LME Aluminium LME Nickel LME Zinc. Trading day summary Intraday prices Volume and open interest Price graph ...
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AU505724B2
alunite alumina production Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Application number AU17908/76A Other languages
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From Alunite Patents (Class 423/120)
Abstract: A process for recovering alumina values from a first liquor having an initial concentration of aluminate ions and hydroxyl ions in solution is described.
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Effect of thermal pretreatment on the two-stage extraction of …
Ozaker and Sengil (Özacar and Sengil, 1999) investigated the main leaching parameters of calcined alunite in concentrated NaOH solutions.Li et al. (Li, 2018) investigated the recovery of potassium oxide and alumina from an alunite concentrate under different conditions based on high temperature reductive roasting followed by low temperature Bayer leaching …
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Leaching kinetics and mechanism of alunite from alunite tailings in
Direct leaching of alunite from alunite tailing in KOH solution is proposed. Optimum leaching conditions of alunite tailings are determined. A dissolution mechanism of alunite that …
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Formation of Alumina from a 'Hydrogen' Alunite
IN a process for making pure alumina which is being investigated by us1, the intermediate product is a basic aluminium sulphate, averaging 39.5 per cent alumina, 40.5 per cent sulphur xide and 20 per cent water. This material is isomorphous with the alunite series, giving an X-ray diffraction pattern almost identical with the potassium and sodium compounds, all having the general …
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The Ammonoalunite Process for Production of Alumina From Clay
The clarified aluminum sulfate liquor is subjected to modest temperature autoclaving in the presence of ammonium ions to precipitate the ammonium analog of alunite, NH4Al3(SO4)2(OH)6, in a ...
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1870 POTENTIAL ECONOMIC IMPACT ON THE ALUMINA …
This thesis briefly reviews attempts to produce alumina from non-bauxitic sources, other than alunite, pointing out their particular economic shortcomings. It then inspects those …
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Improvements in Department of the Interior Leasing of …
Development of alunite would produce both potash, a fertilizer, and alumina, the raw material for aluminum, a strategic material. how the Department of the Interior's decentralized mineral …
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(PDF) ECONOMICAL-ECOLOGICAL ASPECTS OF COMPLEX …
The main component of ore is alunite alumina (51%) ( Gashgay, 1970). The aluminum plant was put into operation in Ganja in 1965 on the base of Zaghlik alunite, which was partially suspended in 1991 based on socio-economic and environmental considerations. Currently, the reconstruction of Ganja Aluminum plant is being completed fully on the ...
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